why do cacti have spine like leaves
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The spine clusters almost act like mini-umbrellas that help to shade the plant. By shading the cactus, these spines also help prevent the cactus from losing water through evaporation. So all in all, spines are adaptations that protect and help cacti hide from animals that may want to eat them.
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The Cacti have adapted to survival in desert and hot dry ecosystems by gradually, generation by generation, converting their green leaves to pikes and spines so as to save the water lost due to persiration through the leaves.
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